Friedrich becker



(NdModeL) P. BECKER. 5 Boring Machine.

Patented April 26, 1881.

; ITED- STATES;

PATENT FFICE.

ISIDOR LIEFMANN, OF SAME PLACE.

BORlNG-lMACHINE.

SPECIFICATION forming part of Letters Patent N0. 240,64,3, dated April 26, 1881 I i Applicationfiled March 262,1881. No model.)

To all whom it may concern:

Be it known that I, FRIEDRICH BECKER, of Oberstein,Germany, have invented a new and useful Improvement in Boring-Machines, of which the following is a specification.

The invention relates particularly to small machines employed for boring or drilling agates or jewels; but it may be embodied in machines for other purposes.

The invention consists, essentially, in a machine comprising a vertical spindle carrying a boring-tool, and adapted to be rotated in fixed bearings by abelt from a driving-shaft which carries a cam or wheel, a vertically-moving carriage which carries a vise or clamp, in which the stone or article to be bored is clamped, and a pivoted weighted lever having an adjustable screw-connection with said carriage, and serving to raise the carriage to press the stone or other article carried in the vise or clamp against the boring-tool until a roller carried by the lever comes in contact with the said wheel or cam upon the driving-shaft, when further boring is prevented until the connection between the weighted lever and the vertically-movable carriage is adjusted. The machine may thus be set to bore to a certain depth or size only and then stop boring, thus enabling one workman to attend to a number of machines.

In the accompanying drawings, Figure 1 represents a side view, partly in section, of a machine embodying my invention. Fig. 2 represents a front view-thereof, and Fig. 3 represents a plan thereof with the spindle and its bearings removed to show the vise or clamp.

Similar letters of reference designate corresponding parts in all the figures.

A designates a portion of the bed of the machine, andB designates aframe supported upon a standard, 13, erected upon the bed, and containin g fixed hearings, in which a vertical spindle, a, may be rotated. Motion is imparted to the spindle aby a belt, b, from a drivingpulley, 0, upon a driving-shaft, D, and said spindle carries the boringtool a. The required tension may be applied to the belt b by an idler-pulley, 0, arranged as clearly seen in Fig. 1.

Immediately below the spindle a are guides or ways d, which may be adjusted accurately toward or from each other by adj listing-screws e, and in the ways or guides 01 is arranged a carriage, f, which is free to move vertically, and. carries at its upper end a vise or clamp, g, in which the agate or other article to be bored is to be securely clamped. By the upward movement of the carriage f the article to be or being bored is fed toward the boring-tool a.

E designates a lever, pivoted at h to a hanger, E attached to the under side of the bed A, and at the end distant from the carriage f the lever is weighted by a weight, *5. At the other end of the lever E is a rod or connection, 3', which is connected with a screw, .70, adapted to be turned in a nut in the bottom of the carriagef, and by turning the screw the carriage f may be raised or lowered relatively to the end of the lever E. At the weighted end the lever E has an upwardly-projecting arm, E, the upper end of which carries a roller, 1, which may engage with a wheel or cam, F, upon the driving-shaft D. The roller 1 might be dispensed with, and is considered as a part of the lever E E.

In the operation of my machine it is obvious that the weight t will tend to press the article to be bored up against the boring-tool a, and

this will continue until the roller 1 is moved back against the wheel or cam F, which forms a stop to limit the upward movement of t e' carriage f. Where the cam F is used, as soon as the roller l touches said cam a quick upward and downward movement will be imparted to the carriage f, which provides for introducing oil into the hole made by the borin g-tool a and prevents the tool from sticking.

By turning the screw is to move it downward in its nut the carriage will be raised relatively to the end of the lever E, with which it is con nected, and the said lever will again raise the carriage and press the work being done up against the boring-tool.

It will be understood that the screw is provides for setting or adjusting the machine to bore a hole of a certain size or depth, and hence one workman may attend to a number of machines, which may all be driven from a single shaft, D.

A spring might be substituted for the weight i; but in either case the lever E maybe regarded as weighted to exert an upward pressure on thecarriage.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, in a boring-machine, with the spindle rotating in fixed bearings, the

driving-shaft, and the yertically-movable 'car-' riage, of a weighted lever, to which said car-* riage is connected, and through which it is raised, and a wheel or cam upon the drivingshaft, with which said lever comes in contact to limit the upward movement of said carriage, substantially as specified.

2. The combination, in a boring-machine, with the rotary spindle, the driving-shaft, and the vertically-movable carriage, of a weighted With esses LoUIs LIEFMANN, FRANZ HASSLAGHER. 

